On Tue, 2008-12-16 at 14:18 -0500, Arjun Nair wrote:
> Scott Lawrence wrote:
> > Well, if we're going to try to come up with the "right" solution (worth
> > discussing, certainly)...
> > 
> > I think that HttpMessage (and therefor SipMessage) should provide two
> > methods:
> >         
> >         getAuthorizationHeader 
> >                 that iterates over values of the Authorization header
> >                 for use by user agents.
> >         
> >         getProxyAuthorizationHeader
> >                 that iterates over values of the Proxy-Authorization
> >                 header for use by proxies.
> >         
> > then something in sipXcommserverLib should provide higher level methods
> > that add the handling of a sipXecs PAI header on top of those:
> > 
> >         getAuthorization 
> >                 For user agents.
> >         
> >         getProxyAuthorization
> >                 For proxies.
> > 
> > These are also iterators, that return true/false to indicate if a "next"
> > identity is returned.  Each should look first for a PAI header with a
> > valid sipXecs signature; if that is found, it's the only identity this
> > method will return.  If no PAI is present, then they revert to iterating
> > over the appropriate header above.
> 
> This will work for the dialog-initiating SUBSCRIBEs. In-dialog
> SUBSCRIBEs, however, will not have a PAI header (but, they will have
> the Proxy-Authorization header). Hence, the status server will be
> forced to challenge them.. Now, I am not sure if the phones would
> choke on that or not. 

If there's a valid Proxy-Authorization header, why doesn't the proxy add
a PAI?

> OTOH, in the status server, we expire the nonce after 5 mins, hence we
> may end up challenging re-SUBSCRIBEs regardless of whether we look for
> the Proxy-Authorization header or not.
> 
> I am doing the tests right now. Will update you on the results.
> 
> Arjun

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